<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avater_box">
        <img src="../assets/img/1557836355450.jpg" alt="" />
      </div>
      <!-- 登录表单 -->
      <el-form ref="loginFormRef" :model="loginform" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-denglu" v-model="loginform.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-mima" v-model="loginform.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginform: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginFormRules: {
        // 验证用户名
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码
        password: [
          { required: true, message: '请输入密码', trigger: 'change' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginform)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 1、将登录成功之后的token，保存到客户端的 sessionStorage中
        // 1.1 项目中出了登录之外的其他API接口，必须在登录之后才访问
        // 1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStrage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2、通过编程式导航跳转到后台主页，路由地址/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="scss" scoped>
//scoped让当前样式只在当前组件生效，如果不加就会全局生效
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  background-image: url("../assets/img/6ef8b2a69ee9a705c8aeb4ec3911cfdd.jpg");
  background-size: cover;
  background-repeat: no-repeat;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avater_box {
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
